Earlier quoted context omitted.
In a large company, a useful thing to do if something fishy is going on is to go see the company's general counsel.[1] If they didn't know about it, they should be told. Their job is to keep the company out of legal trouble. In many cases they have a legal obligation to do something about it. An attorney will rarely tell you to do something illegal; they can be disbarred for that. If they tell you it's OK, then they'…
In the case of NSLs, or UK orders from the security services, it may be illegal to tell anyone who isn't mentioned in the order. Including the company's general counsel. In the event that you are asked to do something illegal, it may be illegal or inadmissible to mention that you were ordered to do so by the government (Matrix-Churchill trial passim)
The nature of such an order requires you to be able to tell the people who need to do it what it is that you need them to do, even if you can't tell them why.
Additionally, anybody with the power to veto such a change also must be provided with a good reason why they can't veto this one. Your legal counsel needs to understand why the change must happen, so he can respond appropriately to questions from pissed off developers and ensure that your company is complying with the letter of the demand (and no more).